Custom Character Sheet computations

To show a concrete example of my question, one of my player is a Monk. As such, he has Unarmord Defense as a feat from first level, defined as follow: Beginning at 1st level, while you are wearing no armor and not wielding a shield, your AC equals 10 + your Dexterity modifier + your Wisdom modifier. It's currents stats are Dex=16(+3) and Wis=16(+3) It's AC is automatically computed to 13 right now (10+dext_mod I bet) I'm trying to change computed AC by a formula in the ac Attribute as such: [[10+@{dexterity_mod} + @{wisdom_mod}]] However, the result is simply a graphical mess in Character Sheet. Formula is displayed as pure text instead of being interpreted. I already had a similar behavior with checks bonuses by the pass... Here's what I see In the Character Sheet: I can even scroll within the text field up to the end of the formula. Someone knows how to force formula to evaluate?

Are you using the 5e by Roll20 sheet? If so, go to the options page on the sheet (the Cog symbol after Core, Bio and Spell), in the middle box on the top row near the bottom of the box is a line for Armor Class calculation. It will be set to Automatic, but you can change it to Custom. Then it lets you pick the calculation you want, which can be 10+Wis+Dex.

@Dakota, Yes we are using 5e sheets, your trick worked just as expected. Thanks for it. However, as specified in my original question, that was only a concrete example of where I'd like to be able to get "visible" numeric attributes displayed as computed values instead of as plain text formula on the sheet and that was the whole point of my question that was to be undertood here. I see that the screenshot of my first post was not properly included, here it is again: Thanks again for the specific Custum AC trick though. My Monk Will be happy not to have to worry about it as he'll had points to dext and wis.

That field isn't supposed to accept calculations, so there's no reason it would be made to do so. There is another function of the sheet to do that, which is that field on the options page.